Mercury-removal process in distillation tower

US20050167335A1Inactive Publication Date: 2005-08-04JAPAN PETROLEUM EXPLORATION CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
JAPAN PETROLEUM EXPLORATION CO LTD
Publication Date
2005-08-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A top temperature T1 of a distillation tower 1 is held below a liquefying temperature of a light fraction by returning a part of an exhaust gas W, which is cooled by a condenser 5, to the upper zone of the distillation tower 1. A bottom temperature T2 is raised up to 300° C. at highest by returning a part of a liquid product P from a re-boiler 3 to a lower zone of the distillation tower 1. When a liquid hydrocarbon L comes in countercurrent contact with a stripping gas G inside the distillation tower 1 with the temperature profile that an inner temperature gradually falls down along an upward direction, mercury is efficiently transferred from the liquid L to a vapor phase without effusion of the light fraction in accompaniment with the exhaust gas W.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a process for stripping mercury from liquid hydrocarbons or the like in a distillation tower under a gas / liquid equilibrium condition. BACKGROUND OF THE INVENTION

[0002] Mercury is conventionally removed from liquid hydrocarbons by an adsorption process, an extraction process using an aqueous liquid, a stripping process and so on. Application of the adsorption or extraction process to heavy natural gas-condensates or crude oils is difficult because of impurities. On the other hand, the stripping process efficiently removes mercury from liquid hydrocarbons, since mercury can be easily transferred from a liquid phase to a vapor phase by countercurrent contact of the liquid hydrocarbons with a stripping gas in a distillation tower. Transfer of mercury from a liquid phase to a vapor phase is promoted due to a high vapor pressure of mercury without unfavorable effects of impurities.

[0003] According to the stripping process, a mercu...

Claims

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